Switch to running quickshell as a systemd service that is auto-restarted if it crashes

install/first-run/omarchy-shell.sh

@@ -0,0 +1,4 @@
+mkdir -p ~/.config/systemd/user
+cp "$OMARCHY_PATH/config/systemd/user/omarchy-shell.service" ~/.config/systemd/user/omarchy-shell.service
+systemctl --user daemon-reload
+systemctl --user enable --now omarchy-shell.service